IrO ₂ /Ir Composite Nanoparticles (IrO ₂ @Ir) Supported on TiN _x O _y Coated TiN: Efficient and Robust Oxygen Evolution Reaction Catalyst for Water Electrolysis

It is crucial but challenging to reduce the required noble-metal loading without compromising catalytic performance of oxygen evolution reaction (OER) catalysts. This study presents a highly active OER catalyst composed IrO2 with Ir rich surface (IrO2@Ir) nanoparticles supported over nano TiN coated TiOxNy (IrO2@Ir/TiN). The present approach demonstrates superior catalysts high activity through small, uniformly dispersed IrO2@Ir nanoparticles, along durability owing robust support and strong catalyst-support interaction. synthesized IrO2@Ir/TiN an 40 wt % exhibits mass-normalized 637 AgIr−1, which 2.4 times that unsupported commercial benchmark electrocatalyst. fine enable significant (∼60 %) reduction in metal obtain equivalent performance. In addition, when evaluated accelerated stress test using potential cycling, outstanding (79 retention) compared (66 retention). loss was attributed dissolution (30 loss) particle growth (70 %), no measurable due corrosion. development ultra-fine ceramic significantly improved utilization open new perspective for catalyst.